Lymantria dispar dispar (LDD) or “Spongy moth” (formerly known as gypsy moth) is a forest defoliating insect found in Ontario. Outbreaks occur every 7 to 10 years, and we’re currently in the midst of an outbreak.
For the map at the side, of deforestation in Ontario in 2021, click here and scroll down the page.
The province of Ontario posts information here, including the life cycle of the pest.
They also make available a protocol document (PDF, 5 pages) with steps to conduct an egg mass survey to estimate the population of the moths on your own property.
News & Related Events:
February 26, 2022 – Webinar presentation on 2021 LDD impacts & 2022 forecast, by Dan Rowlinson, Provincial Forest Health Monitoring, Ministry of Northern Development, Mines, Natural Resources and Forestry, at the FOCA AGM & Spring Seminar
November 14, 2021 – What invasive gypsy moth caterpillars are doing to our lakes and streams (CTVNews)
Oct 27, 2021 – Moth infestation tripled in 2021, with eastern Ontario bearing the brunt – “They’ve been moving eastward toward Ottawa, Carleton Place and Pakenham.” (Ottawa Citizen)
August 31, 2021 – Hastings County asking for help to track LDD infestations (Hastings County)
July 2021 – see additional resources posted by the Environment Council for Clear, Ston(e)y and White Lakes
June 23, 2021 – as reported by the Ontario Woodlot on Twitter: “A member reports that the virus and fungus are taking hold. The photo shows the classic fungus (left) and virus (right) effects.” [see image at the side]
June 2021 – We are pleased to provide access to a recording of an informative June 10, 2021 gypsy moth webinar hosted by the Eastern Ontario Model Forest (EOMF) and Ontario Woodlot Association (OWA) websites . On their webpages you will find a link and passcode to the webinar.
May 22, 2021 – Gypsy moth caterpillars ‘virtually everywhere’ in SW Ontario, expert says (CBC.ca)
May 3, 2021 – Town of Oakville to conduct aerial spraying to combat gypsy moths (Toronto Star)
April 2021 – Gypsy Moth Information from the Regional Forest Health Network (Southern Ontario)
Information about Gypsy Moths:
- QandA Gypsy Moth FINAL August2020
- MNRF Gypsy Moth notes, July 2020
- Gypsy moth surveys for woodlot owners
- Organizing Aerial Spraying Programs (Ontario 2015)
July 22, 2020 – How Ontario is battling a very hungry caterpillar (TVO) – Gypsy-moth caterpillars are killing trees throughout the province.
July 15, 2020 – Eastern Ontario in grip of worst Gypsy moth outbreak in 30 years (Belleville Intelligencer)
July 9, 2020 – Forests in Peterborough and the Kawarthas are under attack (Peterborough Examiner)